664 
Proceedings of Royal Society of Edinburgh. [sess. 
Habitat. — Monterey stone (Arnott !* Kitton !) ;* Antarctic 
Ocean, lat. 78° 10' S., long. 162° W. (Ehrenberg, Ralfs) ; Santa 
Monica deposit (Hardman !)t. 
Aster om. rarus, Rattray. A. elegans , Grev. var. Wallich., Trans. 
Micr. Soc. Lond ., 1860, p. 46, pi. ii. fig. 10. — Diam. *0525 mm. 
Centro-lateral area distinct, extending over f of disc, its extremity 
conical, the sides parallel, with a wide deep lateral conical indentation. 
Markings : rays of two kinds — one straight opposite the centro- 
lateral area, the others sharply bigeniculate at their middle ; the 
compartments symmetrical with respect to the diameter correspond- 
ing to the subobsolete interval, of unequal length, their inner ends 
obtusely rounded, that opposite the subobsolete interval most 
obtuse; areolae distinct, 6 in *01 mm.; the intervals tapering 
outwards, reaching the border. 
Habitat. — Salpce, Indian Ocean (Wallich). 
Asterom. hejptadis. Ralfs. in Pritch. Inf, p. 838, pi. viii. fig. 21. 
— Diam. *0425 to *175 mm. Centro-lateral area suhclavate, the 
sides slightly sinuate, sometimes almost parallel, the inner end 
conical. Markings : rays sharply, 1- or 2- geniculate at or 
slightly beyond their middle ; delicate lines traceable from the 
geniculations to the angles of the compartments ; the compartments 
sometimes of unequal lengths, but symmetrical with respect to the 
diameter corresponding to centro-lateral area, reaching from i to § 
of radius inwards, their inner ends transversely truncate or slightly 
concave towards centre; areolae delicate, 6 in *01 mm.; the rows 
hounding the compartments obvious; intervals broad, a distinct 
lunate ridge at their outer ends .—Spatangidium heptadis, de Breb., 
Bidl. Soc. Linn. Normand ., 1857, p. 296, pi. iii. fig. 2; S. 
ralfsianum, Norman, Quart. Jour. Micr. Sci., 1859, p. 161, pi. vii. 
figs. 7, 8 ; Asterolampra heptadis, Grev., Trans. Micr. Soc. Lond., 
1860, p. 122 ; Asterom. ralfsianus, Grun., Sch., Atl., pi. xxxviii. 
figs. 5-8 (excl. Asterom. Beaumontii, Ehrb., Mon. Ber. Ak., 1844, 
p. 200). 
Habitat. — Californian guano (Greville !) ; Peruvian guano 
(Grove ! de Br4bisson, Schmidt, Greville !) ; Ichaboe guano (J. 
* In the collection of Dr ft. K. Greville. 
t In the collection of Mr Julien Deby. 
